能量

Energy is a resource used to fuel abilities of certain champions in place of mana. It is represented by a yellow bar instead of blue. Unlike mana, the maximum energy and energy regeneration rate of a champion cannot be increased with items; however, the maximum energy can be enhanced with certain runes and a mastery, and energy regeneration can be increased with certain runes and the Crest of the Ancient GolemCrest of the Ancient Golem buff.

Since energy champions start with a full resource bar, it allows them to pull off quick and powerful combos with their abilities. However, due to the maximum energy amount being quite low, they have to wait quite a while to regenerate it before they can do anything again. To aid in this, they all have abilities that can refund some additional energy under particular conditions.

The base energy regen is 10 energy regenerated every second (50 per 5), effectively requiring 20 seconds to regenerate the entire energy pool.

You can regenerate another 3.015 energy per second (15.075 per 5) at level 18 by using runes.

The blue buff increases the energy regeneration by 0.5% of your maximum energy per second, plus 5 flat per second. This means that it will regenerate from 6 energy per second (with the default 200 energy) to 6.26 energy per second (with 252 energy from runes and the Expanded Mind mastery).